Anaerobic Digestion

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This Anaerobic Digestion module is part of the Biomass Energy Training Curriculum, 13 modules developed through a Southern SARE grant and collaboration between Tennessee State University, the University of Tennessee, eXtension.org, and USDA-Rural Development. While it is written as a training guide for TN producers, much of the information is applicable throughout the Southeastern US region.

This curriculum is designed to increase the knowledge base of extension agents and local officials on biomass energy; so that they may, in

Biomass Energy Training Curriculum – TN

Bioenergy Curriculum graphic
 
This curriculum  provides training on biomass energy to extension agents and local officials so that they may deliver this information to their stakeholders. While it is written as a training guide for TN, much of the information is applicable throughout the Southeastern US region.
 

This curriculum was developed through a Southern SARE grant and collaboration between Tennessee State University, the University of Tennessee, eXtension.org, and USDA-Rural Development. 

 

Link to the full TN Biomass Energy Training Curriculum (a 254 page downloadable

Anaerobic Digestion and Biogas

 

Farm Energy IQ logo

This Biogas module provides reasonable expectations for investing in on-farm bio-digesters to convert animal waste to process heat and/or electricity. Learn how to calculate the number of animals needed to build a cost effective system.

Link to all of the Northeast Farm Energy IQ Curriculum, developed by Extension specialists from Penn State, Rutgers and University of Vermont.

This is part of the On Farm Energy Production Curriculum Series: 

Bioenergy Feedstock Production | Biodiesel and SVO | Biogas | Wood

Transformation and Agronomic Use of Nutrients From Digester Effluent

Table of Contents

Anaerobic Digestion Nutrient Transformations

Anaerobic digestion (AD) is the process in which organic compounds are broken down by naturally occurring bacteria, including methanogenic microorganisms under oxygen free conditions, transforming organic matter into biogas (methane (CH4), carbon dioxide (CO2), water vapor, ammonia, and hydrogen sulfide) (Dugba and Zhang, 1999; AgSTAR, 2010b). The end products of this process include biogas, a renewable …

Cayuga County Manure Digester Virtual Tour

livestock and poultry environmental learning center logo with cow, pig, and chicken sillhouettes over a map of the U.S. with three circling arrows

Anaerobic digestion is a manure treatment system that produces biogas. There are many benefits of digestion such as reductions in: odor, pathogens, and greenhouse gases (climate change). Producing biogas from manure yields useful by-products.  The economics of digestion are dependent on state energy policies and co-digestion of off-farm wastes to generate revenue.

Cayuga County Regional Digester (New York)

This virtual tour highlights the Cayuga County Soil & Water Conservation District regional digester. This facility receives …

Farm Energy Anaerobic Digestion and Biogas


Contents:barn

Articles and Fact Sheets


Processing Biomass Into Biogas


Tables Of Contents

Anaerobic Digestion of Animal Manures: Understanding the Basic Processes

Biogas Utilization and Cleanup

Introduction

Biogas generated from anaerobic digestion processes is a clean and environmentally friendly renewable fuel. But it is important to clean, or upgrade, biogas before using it to increase its heating value and to make it useable in some gas appliances such as engines and boilers.

Biogas Utilization

While most large farms use their biogas for heat and power, it is worthwhile to consider all the options before deciding which path to take, including direct sale of biogas to an …

Anaerobic Digesters and Biogas Safety

When manure is anaerobically digested, the biogas produced is primarily composed of methane and carbon dioxide, with lesser amounts of hydrogen sulfide, ammonia, and other gases. Each of these gases has safety issues. Overall, biogas risks include explosion, asphyxiation, disease, and hydrogen sulfide poisoning.

Image: US Municipal Supply Company.

Extreme caution is necessary when working with biogas. Adequate ventilation, appropriate precautions, good work practices, engineering controls, and adequate personal protective equipment will minimize the dangers associated with biogas. Wherever possible, …

Uses of Solids and By-Products of Anaerobic Digestion

Anaerobic Digestate Pile at Scenic View Dairy in Fennville, MI
Anaerobic Digestate Pile, Scenic View Dairy, MI. Photo: M.C. Gould, MSU Extension

Anaerobic digestion generates a wide range of byproducts that farmers can use in their farming operations or sell. Beyond biogas used to generate electricity or as fuel, and liquids used for fertilizer or soil amendments, there are solid byproducts, which have a wide range of applications.

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